# SDR ASAA2023010341405

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 3, 2023
- Submitted: January 5, 2023
- Operation: Air carrier
- Aircraft: [N518AS](https://openairdocs.org/aircraft/N518AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35693
- Aircraft time: 50,600 hours, 14,835 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: UNKNOWN
- Condition: Faulted
- Location: Unknown
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023010341405

## Discrepancy

DURING AFTER START RECALL, MASTER CAUTION "AIR COND" CONT CABIN "ZONE TEMP" ILLUMINATED, RESET WITH MASTER CAUTION, RAN QRH-SUCCESSFUL. GROUNDED - YES. #2 PACK TEMP BITE SHOWS FLT DECK TRIM VALVE FAULT, MSG CLEARED, RAN PACKS & RE-VERIFY BITE, TEST PASS REF B737-800 FIM 21-60 TASK 801. NO HISTORY PAST 30 DAYS.

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